package com.project.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.IOException;

/**
 * 字符过滤器
 */
public class CharFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {

        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setContentType("text/html;charset=utf-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    class MyRequest extends HttpServletRequestWrapper{
        private HttpServletRequest request;

        public MyRequest(HttpServletRequest request) {
            super(request);
            this.request = request;
        }

        @Override
        public String getParameter(String name) {
            String value = request.getParameter(name);
            if (value.indexOf("他妈的")!=-1){
                value = value.replace("他妈的","他奶奶的");
            }
            return "*********";
        }
    }
}
